Transformer.



E. G. REED.

TRANSFORMER.

APPLICATION FILED NOV. 5, 1913.

1,227,314. Patented May 22, 1917.

WITNESSES: INVENTOR 5 aw g4m ATTORNEY UNITED STATES PATENT OFFICE.

; EMERSON G. REED, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T WESTINGHOUSEELECTRIC AND MANUFACTURING COMPANY, A. CORPORATION OF PENNSYLVANIA.

TRANSFORMER.

' To all whom it may concern Be it known that I, EMERsoN G. Reno, acitizen of the United States, and a resident of Wilkinsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Transformers, of which the following is a spec1ficat1on.

My invention relates to stationary nductive apparatus, and it has forits ob]ect to provide an improved transformer structure which willinsure adequate cooling for the transformer coils, and, at the sametime,

will require a minimum amount of activecomprised a plurality ofmagnetizable circuits preferably made of laminated iron,

each of which embraced the oil duct or ducts surrounding the innercoils. Asa result, a large quantity of active material was employed inthe core structure whlch was not essential for either magnetic orelectrical reasons and which added materially to the weight and the costof the transformer.

In my transformer, I propose to provlde oil 'ducts between the severalcoils which will be so positioned that the magnetic ,circuits employingthe greater quantity of active material, such as iron, will not. embracethe aforementioned, ducts. With my type of construction, adequatecooling of the transformer coils is assured, while a material saving inthe amount of laminated iron is effected. In order to disclose myinvention more fully, reference may be had to the following descriptionand the accompanying drawing in which Figure 1 is a sectional plan view,and Fig. 2 is a view, in e1evat1on, of an assembled transformer core andwinding which embodies a form of my invention.

Referring to the drawings, the structure illustrated comprises aplurality of core Specification of Letters Patent.

members 1, 2, 3 and ,4 whichembrace coils 5 and 6. The core members 1and 3 are alike as are also the core members 2 and 4. Each of themembers 1 and 3 is provided with an inside portion 7 the cross sectionalarea of which is materially less than those of the outer side and ends.Side portions 8 are expanded by meansof interleaved laminations in orderto increase the cross sectional areas of the magnetic circuits exteriorly of the coils 5 and 6. The two inner side portions? of the coremembers 1 and 3 abut against each other, and two corresponding sideportions 9 of the core members 2 and 4 abut against the sides of thefirst mentioned portions,.- substantially as shown in Fig. 1. By thusgrouping the core portions 7 and 9,'a maximum amount of iron may beembraced by a minimum mean length of turn in the coils 5 and 6, therebyreducing the cost of the transformer.

The coil 6 is surrounded by the coil 5 which fits closely thereto alongthe sides embraced by the core members 1 and 3. Interposed between theadjacent surfaces of the sides of the coils embraced by the core members4 and 2, are oil ducts 10."

Inasmuch as the core members 1 and 3 which contain the greater portionof the active magnetizable material, preferablylaminated iron, do notembrace any air ducts, a material saving in the total amount of iron iseffected. At the same time, adequate cooling facilities for the coils 5and 6 are provided by the air ducts 10 which are embraced by the coremembers 2 and 4.

The quantity of active material comprised in the core members 2 and 4 ismuch smaller than that comprised in the core members 1 and3, and,therefore, the material wasted by providing the ducts 10 is negligible,as compared with the old form of construction, as previously explained,although the width of the said ducts may be substantially increased. Ihave found that very satisfactory operating results may be ob- PatentedMay 22, 1917.

Application filed November 5, 1913. Serial No. 799,274.

members, the relatively narrow members embracing the said coils andducts, and the relatively wide members embracing the coils only.

2. In a shell-type transformer, the combination with a nest ofsubstantially rectangular coils provided with ventilating ductsextending along the shorter sides only thereof, of a core comprisingrelatively narrowand relatively Wide members, the relatively narrowmembers embracing the said ducts and the shorter sides of the coils, andthe relatively wide members embracing the longer sides only of thecoils.

3. In ashell-type transformer, the combination with a plurality ofnested coils having spaced ventilating ducts positioned intermediatethereof, of a core comprising a plurality of unlike members, the. largerones of which embrace unspaced portions only of the said coils.

4. In a shell-type transformer, the combination with a plurality ofsubstantially rectangularcoils which are nested and provided with spacedventilating ducts intermediate two opposite sides thereof, of a corecomprising a plurality of relatively narrow and relatively wide members,the relatively narrow members embracing the coils and ventilating ducts,and the relatively wide members embracing only the coils.

5. In a shell-type transformer, the. combination with a nest ofsubstantially rectangular coils provided with ventilating ductsextending along the shorter sides only thereof, of a corecomprisingunlike members some of which embrace the shorter sides of said coils andducts, and others of which embrace the longer sides of said coils only.

, 6'. In a cruciform-type transformer, the combination with a nest ofcoils which are in intimate contact with one another on EMERSON G. REED.

Witnesses:

J. B. GIBBs,

B. B. HINES.

